Dielectric Properties of Polypropylene/thermoplastic Elastomer Composite Insulating Materials
Polypropylene(PP)has the advantages of high thermal stability,high working temperature and strong electrical insulation,and can also be recycled and reused,which is expected to become an alternative material for cable insulation in the future.But the mechanical properties of PP need to be toughened to meet the needs of cable laying.Therefore,this paper studies the blends of thermoplastic elastomer hydrogenated styrene-butadiene-styrene block copolymer(SEBS)with polypropylene.PP/SEBS composite materials with different mass fraction are prepared for the infrared spectroscopy,differential scanning,resistivity,breakdown field strength,dielectric spectrum,and structural characterization tests.The test results show that with the increase of SEBS content,the crystallinity,DC volume resistivity and DC breakdown field strength all decrease,the dielectric loss factor increases.The morphology observations indicate that with the increase of SEBS content,the dispersity of SEBS in PP got worse,and the boundnary of spherocrystal got more indistinct,consistent with the decrease of crystallinity.In general,the PP/SEBS ratio of 60/40 has the higher DC resistivity and DC breakdown field strength,and the PP/SEBS ratio of 70/30 has a lower dielectric loss factor.The conclusions can be used for guiding the optimized ratio of polypropylene cable insulation materials in the future.
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